Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6431051 | Closed cavity hydraulic piston and method of making the same | Robert J. Stoppek, Jay H. Ankeny, Allan Richard Schuster | 2002-08-13 |
| 6318241 | Piston for a hydrostatic cylinder block | Robert J. Stoppek | 2001-11-20 |
| 6293185 | Piston for a hydrostatic cylinder block | Robert J. Stoppek | 2001-09-25 |